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A pixel aspect ratio determines the ratio between width and height, a measure of how "square" pixels are on a device.
However, Google lets you customise the device pixel ratio. This measures how many device pixels map onto a single logical pixel (1px in css).
I believe the device pixel ratio is what counts to make various screen sizes appear the same ...

You can set zoom level like following:
map.animateCamera(CameraUpdateFactory.newLatLngZoom(point,15));
Where point is your LatLng position. In this way you can center the map in that point with given zoom level.
Complete method:
@Override
public void onMapReady(GoogleMap map) {
map.setLocationSource(this);
...

I don't know how snapseed is doing. I was working on an app where you can upload image onto a canvas and apply zooming and panning on that image. By extending the ScaleGestureDetector.SimpleOnScaleGestureListener Class in your View or custom view and overriding the onScale() method. You can set the scale factor inside this method.
private class ...

Well my guess would be :
1- You have to use a touch listener on the imageview
2- You have to have a canvas (where you draw the zoomed bitmap)
If you also want you could implement onDragListener to update the circular zoomed image while you drag your finger across the image.
I would say take a look at this link : Android - How to circular zoom/magnify ...

You have to specify particular actions inside onTouchEvent(). Write a switch case for MotionEvents ACTION_DOWN, ACTION_MOVE, ACTION_UP,ACTION_POINTER_DOWN, ACTION_POINTER_UP. That will allow zooming or dragging. Please go through this documentation from google Responding to Touch Events.
Hope this helps :)

The problem is that svg doesn't capture mouse events on a group unless there is a visual element present. You can see this for yourself by listening for a simple click event on the group (instead of call(zoom)). The click event will never be fired.
In the d3 example, Mike Bostock adds a rect that is the width and height of the svg to work around this, and ...

https://developer.chrome.com/devtools/docs/shortcuts
Click inside the dev console, this puts it in focus.
Press the key combination specific to your operating system. 'Ctrl' & '-' to Zoom out on Windows/Linux

Hey @Chris this question is a bit old, but I had the same question myself and this is what I did:
window.addEventListener('resize', function() {
var transform = context.getTransform();
context.setTranslate( transform.e, transform.f);
context.setScale( transform.d, transform.d );
} , false);
in @Phrogz 's function trackTransforms(ctx) i ...

Here is the complete code for pinch zoom and pan (Touch.java with some modifications that can be used practically)
public class Touch implements OnTouchListener {
// These matrices will be used to move and zoom image
public static Matrix matrix = new Matrix();
public static Matrix savedMatrix = new Matrix();
// We can be in one of these 3 states ...

You're not showing the relevant code, what you do show is fine. From what I can gleam you're trying to resize both the pixmap shown in the label, and the label itself. You should be doing one or the other, not both. It's simplest to resize the label, and let the scroll area work its magic. This makes the whole affair trivial.
The code below, sans ...

The creation of the bounds is useless, because when a LatLngBounds does have the same NE and SW(that's the case in your example, because you only have a single place/location), you may simply set the center of the map:
$scope.map.center={
latitude: bounds.getNorthEast().lat(),
longitude: ...